1. Why does an aqueous solution of an acid conduct electricity?
Answer: Acid dissociates ions in aqueous solution, which conducts electricity.
2.Why does dry HCl gas not change the colour of the dry litmus paper?
Answer: Because dry HCl gas does not contain hydronium ions. Hence, it does not changes the colour of dry litmus paper.
3.While diluting an acid, why is it recommended that the acid should be added to water and not water to the acid?
Answer: When acid is mixed with water it evolves heat. The reaction takes place in this process is exothermic. If water is mixed with acid, then because of presence of large amount of acid, more heat would be evolved, which may splashes out and can be resulted into accident due to burning. Therefore, it is recommended that the acid should be added to water and not water to the acid.
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